WHEA 18 Cache Hierarchy Error reboots insanity

vaselineontoast · Monday at 9:29 AM

Hello.
Couple weeks ago i was unfortunate to cross path with infamous WHEA Logger Event ID 18 Machine Check Exception Cache Hierarchy Error. Every time when i want to play something demanding like Warframe, total war warhammer 2 or even garrys mod. Screen goes dark after just clicking icons and whole pc just restart itself.

Only thing that is registered its a WHEA bug in a Event viever with random APIC ID (1, 8, 9, 12...). When looking around other forums and this one , noticed a large amount of these bugs. My bet its a windows updates, but sadly i don’t remember when the crashes appeared. Checked temps, played around in bios, checked for mechanical damage, and no fix. Below i put things that i tried and also specs.

Updated everything that needed update (Windows, drivers,Bios)
Memtest86 (passed)
I uninstalled gpu drivers with DDU and installed multiple different with no success
Checked for temperature, between 70 to 80
Re pasted and add new termopads to gpu
Under-clocking, over-clocking didn’t bring any results
Bios reset to default settings didn’t bring any results
Disabled Precision Boost Overdrive (PBO) no success
Disabled Global C-States, nope
Tested each XMP profiles (3000,3200,3600) no success
Added positive voltage offsets and tested each. Added +0.025 V to cpu and worked only for like 3 hours and crashes and started adding more voltages to test them with no results (+0.050, V+0.075, V+0.100 V)
Removed all CPU overclocking with voltages and none voltages, no success

PCspecs:

CPU: AMD Ryzen 7 5700X 8 Cores / 16 Threads

Motherboard: ASUS PRIME B550M-A BIOS Version 3636 (2026-01-04)

Memory sticks: 16 GB (2×8 GB) Kingston Fury Beast Model: KF3600C17D4/8GX

GPU: PowerColor Radeon RX 6600 XT Fighter 8GB

PSU: Cooler Master MWE Gold V2 750W Fully Modular

Storage: WD Green SN350 1TB NVMe Crucial MX300 275GB SATA SSD WD Blue 1TB HDD

OS:Windows 11 Home 25H2 Build 26200.8737

mblack · Monday at 11:09 AM

WHEA

The WHEA bug in the Event Viewer can be caused by various factors, including hardware failures, outdated or corrupted system drivers, or issues with the processor. To troubleshoot this bug, users can follow these steps:

Check Event Viewer: Open Event Viewer and navigate to the Windows Logs section to check for WHEA errors.

1
Update Drivers: Ensure that all system drivers are up to date, as outdated drivers can cause WHEA errors.

2
Run SFC & DISM Scans: Use the System File Checker (SFC) and Deployment Imaging Service and Management Tool (DISM) to repair corrupted system files.

1
Perform an In-Place Upgrade: If the issue persists, consider performing an in-place upgrade of the Windows operating system to fix the problem without deleting files.

1
By following these steps, users can diagnose and potentially resolve the WHEA bug in the Event Viewer. If the problem continues, it may be necessary to seek professional assistance or consult with a hardware or software technician.

OAT · Monday at 11:36 AM

vaselineontoast said:
Hello.

Follow the steps in the document linked below please: BSOD - Posting Instructions
@zbook usually is the specialist for those types of issues.

BSOD - Posting Instructions

BSOD - Posting Instructions This will show you how to help provide needed information about your system and dump files. It will not contain any personal or sensitive information about you or your data. To get better help with your Windows BSOD issue, please read these instructions and follow...

www.elevenforum.com

vaselineontoast · Monday at 12:12 PM

Hi. Thanks for answers.

All drivers are up to date

Did the DISM /Online /Cleanup-Image /RestoreHealth and sfc /scannow. With these results: Windows Resource Protection did not find any integrity violations.

Here are detailed info about whea errors from event viever
There are 19 errors. When talking with chagtpt he noticed that they all pretty much the same ( MCABank 5 and 0xbea0000001000108)

Code:

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="Microsoft-Windows-WHEA-Logger" Guid="{c26c4f3c-3f66-4e99-8f8a-39405cfed220}" />
  <EventID>18</EventID>
  <Version>0</Version>
  <Level>2</Level>
  <Task>0</Task>
  <Opcode>0</Opcode>
  <Keywords>0x8000000000000000</Keywords>
  <TimeCreated SystemTime="2026-07-05T18:11:19.2510331Z" />
  <EventRecordID>25739</EventRecordID>
  <Correlation ActivityID="{4d217fbb-3a10-4741-aac3-3402a57b50bf}" />
  <Execution ProcessID="2372" ThreadID="4240" />
  <Channel>System</Channel>
  <Computer>Arekpc</Computer>
  <Security UserID="S-1-5-19" />
  </System>
- <EventData>
  <Data Name="ErrorSource">3</Data>
  <Data Name="ApicId">0</Data>
  <Data Name="MCABank">5</Data>
  <Data Name="MciStat">0xbea0000000000108</Data>
  <Data Name="MciAddr">0x6dc2ccfe</Data>
  <Data Name="MciMisc">0xd0130fff00000000</Data>
  <Data Name="ErrorType">9</Data>
  <Data Name="TransactionType">2</Data>
  <Data Name="Participation">256</Data>
  <Data Name="RequestType">0</Data>
  <Data Name="MemorIO">256</Data>
  <Data Name="MemHierarchyLvl">0</Data>
  <Data Name="Timeout">256</Data>
  <Data Name="OperationType">256</Data>
  <Data Name="Channel">256</Data>
  <Data Name="Length">2063</Data>
  <Data Name="RawData">435045521002FFFFFFFF040001000000020000000F0800000C0B120005071A140000000000000000000000000000000000000000000000000000000000000000BDC407CF89B7184EB3C41F732CB57131FE6FF5E89C91C54CBA8865ABE14913BB83F9F5A7A90CDD01020000000000000000000000000000000000000000000000A0010000C00000000003000001000000ADCC7698B447DB4BB65E16F193C4F3DB0000000000000000000000000000000001000000000000000000000000000000000000000000000060020000E00000000003000000000000B0A03EDC44A19747B95B53FA242B6E1D0000000000000000000000000000000001000000000000000000000000000000000000000000000040030000A80400000003000000000000011D1E8AF94257459C33565E5CC3F7E800000000000000000000000000000000010000000000000000000000000000000000000000000000E8070000270000000003000000000000A13248C3C302524CA9F19F1D5D7723FC000000000000000000000000000000000300000000000000000000000000000000000000000000007F010000000000000002010000000000120FA2000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007010000000000000000000000000000120FA200000810000B32F87EFFFB8B170000000000000000000000000000000000000000000000000000000000000000F50157A5EFE3DE43AC72249B573FAD2C03000000000000009F00020600000000FECCC26D000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000800800100000000000000000000000000000000000000000000000000000400000002000000832F7EA9A90CDD01000000000000000000000000000000000000000005000000080100000000A0BEFECCC26D0000000000000000FF0F13D00A0000000000000000000000B00005000000004D00000000F9010000030000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003B00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000FF00000000000000000000000000000000000000000000000000</Data>
  </EventData>
  </Event>

Also here is a link to v2 log collector results:

Code:

https://drive.google.com/file/d/1UfAxWs9AkEMbmBTgM4yoA1VaKndfJ9yM/view?usp=drive_link

zbook · Monday at 11:23 PM

1) During the troubleshooting please use English as the default language so that the log files can be scanned and read.

Add, Remove, and Change Display Language in Windows 10

How to Add or Remove Language Packs and Change Display Language in Windows 10

www.tenforums.com

Change Display Language in Windows 10

How to Change Display Language in Windows 10

www.tenforums.com

2) Add WMIC:

Add or Remove WMIC command Feature in Windows 11

This tutorial will show you how to add or remove the WMIC command as an optional feature for all users in Windows 11. The WMI command-line (WMIC) utility provides a command-line interface for Windows Management Instrumentation (WMI). WMIC is compatible with existing shells and utility commands...

www.elevenforum.com

DISM /Online /Add-Capability /CapabilityName:WMIC~~~~

3) Run tuneup_plus_log.bat > post a share link

https://www.tenforums.com/attachments/bsod-crashes-debugging/360137d1645183388-batch-files-use-bsod-debugging-tuneup_plus_log.bat

Batch files for use in BSOD debugging - Windows 10 Help Forums

Information This thread is for use by the BSOD team to store batch files that can be used to collect additional data, fix settings or anything else that is useful in debugging BSOD problems in Windows 10. The way I see it working is the first

www.tenforums.com

Batch files for use in BSOD debugging - Windows 10 Help Forums

Information This thread is for use by the BSOD team to store batch files that can be used to collect additional data, fix settings or anything else that is useful in debugging BSOD problems in Windows 10. The way I see it working is the first

www.tenforums.com

4) Run gather_additional_dump_files.bat > post a share link

https://www.tenforums.com/attachments/bsod-crashes-debugging/358470d1643456903-batch-files-use-bsod-debugging-gather_additional_dump_files.bat

Batch files for use in BSOD debugging - Windows 10 Help Forums

Information This thread is for use by the BSOD team to store batch files that can be used to collect additional data, fix settings or anything else that is useful in debugging BSOD problems in Windows 10. The way I see it working is the first

www.tenforums.com

Batch files for use in BSOD debugging - Windows 10 Help Forums

Information This thread is for use by the BSOD team to store batch files that can be used to collect additional data, fix settings or anything else that is useful in debugging BSOD problems in Windows 10. The way I see it working is the first

www.tenforums.com

5) Run administrative command prompt: > post share links

wevtutil epl Application "%userprofile%\Desktop\application.evtx"

wevtutil epl System "%userprofile%\Desktop\system.evtx"

Code:

Event[19730]
  Log Name: System
  Source: EventLog
  Date: 2026-07-05T20:11:17.5400000Z
  Event ID: 6008
  Task: Brak
  Level: B│ŕdy
  Opcode: N/A
  Keyword: Klasyczny,
  User: N/A
  User Name: N/A
  Computer: Arekpc
  Description:
Poprzednie zamkniŕcie systemu o 20:10:25 ?05.?07.?2026 by│o nieoczekiwane.

Code:

Event[19421]
  Log Name: System
  Source: Microsoft-Windows-Kernel-Power
  Date: 2026-07-04T16:56:34.8170000Z
  Event ID: 41
  Task: N/A
  Level: Krytyczne
  Opcode: Informacje
  Keyword: N/A
  User: S-1-5-18
  User Name: ZARZąDZANIE NT\SYSTEM
  Computer: Arekpc
  Description:
System zosta│ uruchomiony ponownie bez uprzedniego czystego zamkniŕcia. Mo┐liwe przyczyny b│ŕdu: system przesta│ odpowiadaŠ lub uleg│ awarii albo nast╣pi│a nieoczekiwana utrata zasilania.

vaselineontoast · Tuesday at 9:16 AM

Thanks for help.
Link to tuneup_plus_log.bat results :
Tuneup.log

Link togather_additional_dump_files.bat results:
LiveKernel Reports 2026-07-07 (14-59-41).zip

Link to application.evtx:
application.evtx

Link to system.evtx:
system.evtx

zbook · Tuesday at 9:22 AM

Please post a new V2 (English).

vaselineontoast · Tuesday at 9:30 AM

Link to V2
AREKPC-(2026-07-07_15-29-35).zip

zbook · Tuesday at 12:27 PM

1) Please choose one of the temperature monitoring software applications: Speed fan, Speecy, HW monitor:

SpeedFan - Access temperature sensor in your computer: SpeedFan - Access temperature sensor in your computer

SpeedFan - Access temperature sensor in your computer

Speccy - Free Download - Piriform: Speccy - System Information - Free

Download Speccy | Find your computer specs, free!

Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version today.

www.piriform.com

Download Speccy | Find your computer specs, free!

Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version today.

www.ccleaner.com

HWMONITOR | Softwares | CPUID: HWMONITOR | Softwares | CPUID

HWMONITOR | Softwares | CPUID

HWMonitor for Windows® x86/x64 is a hardware monitoring program that reads PC systems main health sensors : voltages, temperatures, powers, currents, fans speed, utilizations, clock speeds ... The program handles : CPU and GPU-level hardware monitoring...

www.cpuid.com

2) Run Memtest86+ for 8 or more passes > take pictures > post images or share links

Memtest86+ | The Open-Source Memory Testing Tool

Just 1 error is a test fail and testing can be aborted.

The more the passes the better the testing conditions.

It sometimes takes passes into the 20's to detect malfunctioning RAM.

The RAM can be tested all at one time or one at a time in the same DIMM.

Memtest86+ | The Open-Source Memory Testing Tool

MemTest86+ - Test RAM

3) Run Sea Tools Long generic test (all drives) > post images or share links

SeaTools | Seagate US

SeaTools - Quick diagnostic tool that checks the health of your drive.

www.seagate.com

4) Run HD Sentinel (all drives) > post images or share links (do not run until posting results for each steps 5, 6, 7 and 8)

Hard Disk Sentinel - HDD health and temperature monitoring
a) Overview
b) Temperature
c) SMART

5) Run FurMark - GPU Stress Test Windows 10 Performance Maintenance Tutorials

Aim for 1 hour testing.

Please make note of the importance of temperature monitoring and aborting the test in the GPU link.

Abort testing as needed for temperature changes, freezing, display artifacts, etc.

FurMark - GPU Stress Test Windows 10 Performance Maintenance Tutorials:
FurMark - GPU Stress Test

6) Run Prime95 - Stress Test Your CPU

Prime95 - Stress Test Your CPU Windows 10 Performance Maintenance Tutorials

Prime95 - Stress Test Your CPU

Stress test your CPU for stability issues with Prime95

www.tenforums.com

a) Record the maximum temperature and post the maximum temperature into the thread

b) Record test duration and post the uninterrupted test duration into the thread

c) Aim for testing > 3 hrs and abort testing as needed for freezing, temperature changes (see link)

d) Post an image displaying the Prime95 report

e) Post a share link with Prime95 log files

Code:

Event[18736]
  Log Name: System
  Source: Microsoft-Windows-WHEA-Logger
  Date: 2026-07-03T19:50:10.6410000Z
  Event ID: 18
  Task: N/A
  Level: Error
  Opcode: Info
  Keyword: N/A
  User: S-1-5-19
  User Name: ZARZąDZANIE NT\USúUGA LOKALNA
  Computer: Arekpc
  Description:
A fatal hardware error has occurred.

Reported by component: Processor Core
Error Source: Machine Check Exception
Error Type: Cache Hierarchy Error
Processor APIC ID: 0

The details view of this entry contains further information.

A1000005
141
124

Code:

===============================================================================
Common Platform Error Record @ ffffd68f8734f020
-------------------------------------------------------------------------------
Record Id     : 01dd0bc54c53245a
Severity      : Fatal (1)
Length        : 13568
Creator       : Microsoft
Notify Type   : Machine Check Exception
Timestamp     : 7/4/2026 14:56:34 (UTC)
Flags         : 0x00000002 PreviousError

===============================================================================
Section 0     : Processor Generic
-------------------------------------------------------------------------------
Descriptor    @ ffffd68f8734f0a0
Section       @ ffffd68f8734f370
Offset        : 848
Length        : 192
Flags         : 0x00000001 Primary
Severity      : Fatal



===============================================================================
Section 1     : x86/x64 Processor Specific
-------------------------------------------------------------------------------
Descriptor    @ ffffd68f8734f0e8
Section       @ ffffd68f8734f430
Offset        : 1040
Length        : 224
Flags         : 0x00000000
Severity      : Fatal


No valid data fields are present.

===============================================================================
Section 2     : x86/x64 MCA
-------------------------------------------------------------------------------
Descriptor    @ ffffd68f8734f130
Section       @ ffffd68f8734f510
Offset        : 1264
Length        : 1192
Flags         : 0x00000000
Severity      : Fatal


Error         : Unknown (Proc 0 Bank 0)
  Status      : 0x0000000000000000

===============================================================================
Section 3     : {c34832a1-02c3-4c52-a9f1-9f1d5d7723fc}
-------------------------------------------------------------------------------
Descriptor    @ ffffd68f8734f178
Section       @ ffffd68f8734f9b8
Offset        : 2456
Length        : 39
Flags         : 0x00000000
Severity      : Informational

*** Unknown section format ***

===============================================================================
Section 4     : Error Packet
-------------------------------------------------------------------------------
Descriptor    @ ffffd68f8734f1c0
Section       @ ffffd68f8734f9df
Offset        : 2495
Length        : 1272
Flags         : 0x00000000
Severity      : Fatal

Unable to locate symbol for nt!WHEA_ERROR_PACKET

vaselineontoast · Wednesday at 11:11 AM

Hi. To monitor the temps i used hwinfo64.

2. Sorry i didn’t noticed that link directs to different memtest. Just used regular memtest for 4 passes and it passed.
Link to a memtest html and log
Html
Log

3.Images of drives using long test sea tools
SSD

NVME

Hard drive

4.Here is a disk report from Hard disk sentiel
Disk report

5. I did run Furmark for like 1,2 hour and no issues.
Average temps:
GPU Temperature: 76,5 C
GPU Hot spot Temperature: 101,9 C ( That card run like this for whole time and no issues, these cards have crappy cooling, but there are stable)

Link to HWINFO64 monitoring tool in .CSV

6. Prime95 runned for like 1,3 hours 9 (sorry for short time) and no high temps, crashes, restarts.
CPU average temp (Tctl/Tdie): 64 C
CPU CCD1 (Tdie): 63
Prime95 report:

Link to prime results.txt

zbook · Wednesday at 3:59 PM

1) Please run Prime95

Small FFT for 1 hour > post share links

Large FFTs for 2 hours > post share links

2) Run each of the OCCT 1 hour tests > post share links

OCBASE/OCCT : Free, all-in-one stability, stress test, benchmark and monitoring tool for your PC

Ocbase is the home of OCCT, the most popular all-in-one stability / stress testing / benchmarking / monitoring tool available for PC

www.ocbase.com

Disk: #0: Crucial_CT275MX300SSD1 --
C: [Dysk lokalny SSD]
Health . . . . . . . . . . . . . . . . . . . . . : ############-------- 61 % (Fair)
Performance . . . . . . . . . . . . . . . . . . : #################### 100 % (Excellent)

joeandmarg0 · 2026-07-09T06:29:19-0400

Could you check Reliability History for flagged entries,especially at the start of the problem.
To access it,start typing ---reliability---in the Search box.
Also look through DirectX for any reports.
To start it,type ---dxdiag ---into the Search box.It is a Windows 11 component for gaming.

vaselineontoast · 2026-07-09T08:11:29-0400

1. Small FFT for 1 hour

Large FFTs for 2 hours

2. Due to time constrains managed to run only CPU + RAM ( Default settings)

After running all those benchmarks no crashes. Started Warframe boom black screen and restart.
3. Reliability History:

4.DxDiag.txt

zbook · 2026-07-09T09:51:32-0400

During the troubleshooting files are needed that are missing.

Please make sure that disk cleanup and third party cleaning software are not used

Complete each OCCT 1 hour test over time > post share links

For new BSODs post share links into the newest post:

a) V2

BSOD - Posting Instructions

BSOD - Posting Instructions This will show you how to help provide needed information about your system and dump files. It will not contain any personal or sensitive information about you or your data. To get better help with your Windows BSOD issue, please read these instructions and follow...

www.elevenforum.com

b) Run administrative command prompt: > post share links

wevtutil epl Application "%userprofile%\Desktop\application.evtx"

wevtutil epl System "%userprofile%\Desktop\system.evtx"

vaselineontoast · 2026-07-09T13:37:32-0400

Due to time i will upload half of tests. Will continue tomorrow.

CPU (extreme)

Linpack

Memory

Link to log collector V2 log collector zip file

Link administrative command prompts zip file

vaselineontoast · 2026-07-10T10:32:09-0400

Hi, interesting thing happened. Crashes on gpu but errors are cpu. wtf

GPU 3d adaptive (extreme) crashed immediately

Vram didnt crashed

Power crashed immediately

SSD(os) passed

HDD passed

nvme passed

Here are link to log collerctor
link log collector zip file
Here is link to those commands
link to commands zip file

zbook · 2026-07-10T14:42:15-0400

Please swap test the PSU.

PerpetualCycle · 2026-07-10T15:54:41-0400

I am lazy today (sick yesterday). Here is what google AI and I believe it is pretty spot-on. I would follow these steps.

The WHEA Event ID 18: Cache Hierarchy Error is a critical hardware instability log generated when the CPU detects an internal communications failure (usually within its L1/L2/L3 cache blocks or memory controller). It typically causes a sudden black screen freeze, a hard lock, or an immediate automatic reboot without showing a traditional Blue Screen of Death (BSOD). [1, 2, 3]
This error is overwhelmingly common on AMD Ryzen processors (especially the Ryzen 3000, 5000, and 5000X3D series), though it occasionally impacts Intel processors. It most frequently triggers during low-load idle transitions (like watching YouTube, web browsing, or waking from sleep) rather than under heavy gaming stress. [1, 2, 3, 4, 5]

Primary Causes

Unstable Memory Overclocking: The CPU's Infinity Fabric or Memory Controller cannot handle your RAM's XMP, DOCP, or EXPO profile.
Aggressive Factory Boosts / Undervolting: Features like Precision Boost Overdrive (PBO) or a poorly tuned Curve Optimizer can starve individual cores of necessary voltage at low workloads.
Outdated BIOS: Older motherboard firmware mishandling core voltage tables.
Degraded or Faulty CPU Silicon: A physically defective processor core that requires a manufacturer replacement (RMA). [1, 2, 3, 4, 5, 6, 7]

Step-by-Step Troubleshooting Guide
Work through these fixes starting from the simplest configuration changes to isolating hardware defects.

1. Turn Off RAM and CPU Overclocks (XMP/DOCP/PBO) [1]
Overclocking profiles push the CPU's memory controller to its absolute limit. [1, 2]

Restart your PC and press Del or F2 to enter your motherboard's BIOS/UEFI.
Locate and disable XMP, DOCP, or EXPO; let your RAM run at its baseline stock speed (e.g., 2133MHz or 2666MHz).
Locate Precision Boost Overdrive (PBO) or Performance Boost and switch it to Disabled or Auto.
Save changes and reboot to see if the crashes stop. [1, 2, 3, 4, 5]

2. Update Your Motherboard BIOS and Chipset Drivers [1]
Motherboard vendors regularly push BIOS updates that specifically stabilize CPU core voltage delivery and fix microcode bugs causing cache drops. [1]

Go to your motherboard manufacturer’s official support page (e.g., ASUS, MSI, Gigabyte, ASRock).
Download and flash the latest stable BIOS version for your exact motherboard model.
Download and install the latest Chipset Drivers directly from AMD's Driver Portal or Intel's website, depending on your build. [1, 2, 3, 4]

3. Adjust Power Supply Idle Control in BIOS [1]
Many Ryzen systems crash during idle transitions because the CPU drops its voltage lower than a specific core can handle to save power. [1, 2]

Enter your BIOS and look for a setting named Power Supply Idle Control (often hidden under Advanced -> AMD CBS).
Change it from Low Current Idle or Auto to Typical Current Idle.
Alternative: Try disabling Global C-States in the BIOS to prevent the CPU from entering deep, unstable low-power sleep states. [1, 2, 3, 4, 5]

4. Find the Specific Core Using the APIC ID [1]
If the crashes persist, you can pinpoint the exact core causing the error by checking the logs deeper. [1]

Right-click the Windows Start menu and open Event Viewer.
Go to Windows Logs -> System.
Find the red WHEA-Logger Event 18 error and click on it.
Look at the description field for the Processor APIC ID number. [1, 2, 3, 4, 5]

If the APIC ID is consistently the exact same number every single time your system crashes, it means that one specific core is physically unstable and starving for power. You can attempt to bypass this by going into your BIOS Curve Optimizer and adding a small positive voltage offset (e.g., +5 or +10) specifically to that core, or adding a generic small positive CPU Vcore voltage offset (+0.05V). [1, 2, 3, 4, 5]

What if Nothing Works?
If your system continues to log Event 18 errors even with a flashed BIOS, stock RAM speeds, and PBO turned off, the internal cache on your processor is permanently unstable. [1, 2]
If your processor is still under warranty, contact the manufacturer (AMD Warranty Support or Intel Support) to file an RMA (Return Merchandise Authorization) claim. Clearly state that you are experiencing unresolvable WHEA Event 18 Cache Hierarchy Errors at default stock settings; manufacturers are highly familiar with this specific error and will usually replace the faulty processor promptly. [1, 2]
To help narrow down the next steps, could you provide your CPU model and motherboard model? Let me know if you need instructions on how to manually adjust your core voltages or if you've already tried disabling XMP/DOCP. [1, 2]

AI can make mistakes, so double-check responses

WHEA 18 Cache Hierarchy Error reboots insanity

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